/*
 * Fundamental constants relating to Neighbor Discovery Protocol
 *
 * Copyright (C) 2020, Broadcom.
 *
 *      Unless you and Broadcom execute a separate written software license
 * agreement governing use of this software, this software is licensed to you
 * under the terms of the GNU General Public License version 2 (the "GPL"),
 * available at http://www.broadcom.com/licenses/GPLv2.php, with the
 * following added to such license:
 *
 *      As a special exception, the copyright holders of this software give you
 * permission to link this software with independent modules, and to copy and
 * distribute the resulting executable under terms of your choice, provided that
 * you also meet, for each linked independent module, the terms and conditions of
 * the license of that module.  An independent module is a module which is not
 * derived from this software.  The special exception does not apply to any
 * modifications of the software.
 *
 *
 * <<Broadcom-WL-IPTag/Dual:>>
 */

#ifndef _bcmipv6_h_
#define _bcmipv6_h_

#ifndef _TYPEDEFS_H_
#include <typedefs.h>
#endif

/* This marks the start of a packed structure section. */
#include <packed_section_start.h>

/* Extension headers */
#define IPV6_EXT_HOP	0
#define IPV6_EXT_ROUTE	43
#define IPV6_EXT_FRAG	44
#define IPV6_EXT_DEST	60
#define IPV6_EXT_ESEC	50
#define IPV6_EXT_AUTH	51

/* Minimum size (extension header "word" length) */
#define IPV6_EXT_WORD	8

/* Offsets for most extension headers */
#define IPV6_EXT_NEXTHDR	0
#define IPV6_EXT_HDRLEN		1

/* Constants specific to fragmentation header */
#define IPV6_FRAG_MORE_MASK	0x0001
#define IPV6_FRAG_MORE_SHIFT	0
#define IPV6_FRAG_OFFS_MASK	0xfff8
#define IPV6_FRAG_OFFS_SHIFT	3

/* For icmpv6 */
#define ICMPV6_HEADER_TYPE	0x3A
#define ICMPV6_PKT_TYPE_RA	134
#define ICMPV6_PKT_TYPE_NS	135
#define ICMPV6_PKT_TYPE_NA	136

#define ICMPV6_ND_OPT_TYPE_TARGET_MAC	2
#define ICMPV6_ND_OPT_TYPE_SRC_MAC		1

#define ICMPV6_ND_OPT_LEN_LINKADDR		1

#define ICMPV6_ND_OPT_LEN_LINKADDR		1

#define IPV6_VERSION 	6
#define IPV6_HOP_LIMIT 	255

#define IPV6_ADDR_NULL(a)	((a[0] | a[1] | a[2] | a[3] | a[4] | \
							 a[5] | a[6] | a[7] | a[8] | a[9] | \
							 a[10] | a[11] | a[12] | a[13] | \
							 a[14] | a[15]) == 0)

#define IPV6_ADDR_LOCAL(a)	(((a[0] == 0xfe) && (a[1] & 0x80))? TRUE: FALSE)

/* IPV6 address */
BWL_PRE_PACKED_STRUCT struct ipv6_addr {
		uint8		addr[16];
} BWL_POST_PACKED_STRUCT;

/* use masks, htonl instead of bit fileds */
#ifndef IL_BIGENDIAN

/* ICMPV6 Header */
BWL_PRE_PACKED_STRUCT struct icmp6_hdr {
	uint8	icmp6_type;
	uint8	icmp6_code;
	uint16	icmp6_cksum;
	BWL_PRE_PACKED_STRUCT union {
		uint32 reserved;
		BWL_PRE_PACKED_STRUCT struct nd_advt {
			uint32	reserved1:5,
				override:1,
				solicited:1,
				router:1,
				reserved2:24;
		} BWL_POST_PACKED_STRUCT nd_advt;
	} BWL_POST_PACKED_STRUCT opt;
} BWL_POST_PACKED_STRUCT;

/* Ipv6 Header Format */
BWL_PRE_PACKED_STRUCT struct ipv6_hdr {
	uint8	priority:4,
		version:4;
	uint8	flow_lbl[3];
	uint16	payload_len;
	uint8	nexthdr;
	uint8 	hop_limit;
	struct	ipv6_addr	saddr;
	struct	ipv6_addr	daddr;
} BWL_POST_PACKED_STRUCT;

/* Neighbor Advertisement/Solicitation Packet Structure */
BWL_PRE_PACKED_STRUCT struct bcm_nd_msg {
	struct	icmp6_hdr	icmph;
	struct	ipv6_addr	target;
} BWL_POST_PACKED_STRUCT;

/* Neighibor Solicitation/Advertisement Optional Structure */
BWL_PRE_PACKED_STRUCT struct nd_msg_opt {
	uint8 type;
	uint8 len;
	uint8 mac_addr[ETHER_ADDR_LEN];
} BWL_POST_PACKED_STRUCT;

/* Ipv6 Fragmentation Header */
BWL_PRE_PACKED_STRUCT struct ipv6_frag {
	uint8	nexthdr;
	uint8	reserved;
	uint16	frag_offset;
	uint32	ident;
} BWL_POST_PACKED_STRUCT;

#endif /* IL_BIGENDIAN */

/* This marks the end of a packed structure section. */
#include <packed_section_end.h>

static const struct ipv6_addr all_node_ipv6_maddr = {
									{ 0xff, 0x2, 0, 0,
									0, 0, 0, 0,
									0, 0, 0, 0,
									0, 0, 0, 1
									}};

#define IPV6_ISMULTI(a) (a[0] == 0xff)

#define IPV6_MCAST_TO_ETHER_MCAST(ipv6, ether) \
{ \
	ether[0] = 0x33; \
	ether[1] = 0x33; \
	ether[2] = ipv6[12]; \
	ether[3] = ipv6[13]; \
	ether[4] = ipv6[14]; \
	ether[5] = ipv6[15]; \
}

#endif	/* !defined(_bcmipv6_h_) */